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34 Cards in this Set
- Front
- Back
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acceleration
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the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change.
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force
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a push or a pull exerted on an object in order to change the motion of the object; force has size and direction
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free fall
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the motion of a body when only the force of gravity is acting on the body.
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friction
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a force that opposes motion between two surfaces that are in contact.
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gravity
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a force of attraction between objects that is due to their masses.
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inertia
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the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object.
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mass
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a measure of the amount of matter in an object.
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motion
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an object's change in position relative to a reference point.
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newton
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the SI unit for force (symbol, N)
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reaction
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A response or change.
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slope
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a measure of the slant of a line; the ratio of rise over run.
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tension
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stress that happens when forces act to stretch an object.
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terminal velocity
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the constant velocity of a falling object when thge force of air resistance is equal in magnitude and opposite in direction to the force of gravity.
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velocity
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the speed of an object in a particular direction.
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weight
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a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe.
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speed
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the rate at which an object moves.
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positive acceleration
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an increase in speed
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negative acceleration
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a decrease in speed
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balanced force
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when two forces act on each other, resulting in no movement.
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net force
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the combination of the forces acting on an object.
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compression
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a force that is exerted when matter is pushed or squeezed.
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unbalanced force
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When unbalanced forces are acting on an object, they cause a change in the velocity of an object.
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kinetic friction
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friction between moving surfaces.
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static friction
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Can cause an object not to move because the force of static friction is balancing the force applied. With a large enough force, static friction can be replaced by kinetic friction.
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centripetal force
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the unbalanced force that makes things move in a elliptical path (or in a circular path)
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air resistance
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slows the acceleration of falling objects
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push/pull
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what is needed to move an object at rest.
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reference point
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An object that is used to measure motion in another object.
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sliding/rolling friction
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Both are examples of kinetic friction. The force of sliding kinetic friction is greater than the force of rolling kinetic friction.
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surface area
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The surface of an object will determine how an object will move.
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elastic force
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when something is being stretched or compressed. Gravity is often balanced by elastic forces.
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m/s2
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the unit for acceleration
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vacuum
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used to describe a place in which there is no matter.
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orbit
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Gravity provides the centripetal force that keeps things in orbit. There must be an unbalanced force acting on anything in orbit.
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